fix(tabs): Procesar eventos ANTES de dibujar

Problema: Al hacer clic en un tab, el dibujo visual mostraba el
tab viejo como activo porque is_selected se calculaba ANTES de
procesar el clic.

Solución: Separar en dos passes:
- Pass 1: Detectar clics y actualizar state.selected
- Pass 2: Dibujar con el estado ya actualizado

Esto elimina el "parpadeo" donde el tab visual no coincidía
con el tab lógico durante un frame.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/widgets/tabs.zig

@@ -247,9 +247,53 @@ pub fn tabsRect(
         total_width += width;
     }
 
-    // Draw tabs
+    // ==========================================================================
+    // PASS 1: Process input events BEFORE drawing (fix visual lag on click)
+    // ==========================================================================
     var tab_x = bar_rect.x;
 
+    for (tab_list, 0..) |tab, i| {
+        if (i >= tab_widths.len) break;
+
+        const tab_width = tab_widths[i];
+        const tab_rect = Layout.Rect.init(tab_x, bar_rect.y, tab_width, config.tab_height);
+        const is_hovered_input = tab_rect.contains(mouse.x, mouse.y) and !tab.disabled;
+
+        // Handle close button click (pass 1)
+        if (config.show_close and tab.closable) {
+            const close_x = tab_x + @as(i32, @intCast(tab_width - config.close_size - 8));
+            const close_y = bar_rect.y + @as(i32, @intCast((config.tab_height - config.close_size) / 2));
+            const close_rect = Layout.Rect.init(close_x, close_y, config.close_size, config.close_size);
+            const close_hovered = close_rect.contains(mouse.x, mouse.y);
+
+            if (close_hovered) {
+                state.close_hovered = @intCast(i);
+            }
+
+            if (mouse_pressed and close_hovered) {
+                result.closed = true;
+                result.closed_index = i;
+            }
+        }
+
+        // Handle tab click (pass 1) - update state BEFORE drawing
+        if (mouse_pressed and is_hovered_input and state.close_hovered != @as(i32, @intCast(i))) {
+            ctx.requestFocus(widget_id);
+            if (state.selected != i) {
+                state.selected = i;
+                result.changed = true;
+                result.selected = i;
+            }
+        }
+
+        tab_x += @as(i32, @intCast(tab_width));
+    }
+
+    // ==========================================================================
+    // PASS 2: Draw tabs with UPDATED state
+    // ==========================================================================
+    tab_x = bar_rect.x;
+
     for (tab_list, 0..) |tab, i| {
         if (i >= tab_widths.len) break;
 
@@ -328,38 +372,20 @@ pub fn tabsRect(
         const text_y = bar_rect.y + @as(i32, @intCast((config.tab_height - 8) / 2));
         ctx.pushCommand(Command.text(tab_x + @as(i32, @intCast(config.padding_h)), text_y, tab.label, text_color));
 
-        // Draw close button
+        // Draw close button (events already handled in Pass 1)
         if (config.show_close and tab.closable) {
             const close_x = tab_x + @as(i32, @intCast(tab_width - config.close_size - 8));
             const close_y = bar_rect.y + @as(i32, @intCast((config.tab_height - config.close_size) / 2));
             const close_rect = Layout.Rect.init(close_x, close_y, config.close_size, config.close_size);
 
             const close_hovered = close_rect.contains(mouse.x, mouse.y);
-            if (close_hovered) {
-                state.close_hovered = @intCast(i);
-            }
-
             const close_color = if (close_hovered) colors.close_hover else colors.close_color;
 
             // Draw X
             ctx.pushCommand(Command.text(close_x + 3, close_y + 2, "x", close_color));
-
-            // Handle close click
-            if (mouse_pressed and close_hovered) {
-                result.closed = true;
-                result.closed_index = i;
-            }
         }
 
-        // Handle tab click
+        // Note: Tab click handling moved to Pass 1 (before drawing)
-        if (mouse_pressed and is_hovered and state.close_hovered != @as(i32, @intCast(i))) {
-            ctx.requestFocus(widget_id);
-            if (state.selected != i) {
-                state.selected = i;
-                result.changed = true;
-                result.selected = i;
-            }
-        }
 
         tab_x += @as(i32, @intCast(tab_width));
     }